Currently the knives in my opinion aren’t that useful. It takes 2 slashes to kill an enemy, and after the first slash they turn around a shoot you. You can shoot them and then slash them (or vice versa) but if you’re doing this to a guy behind a group of say 2, the other 2 guys will turn around and then kill you.
What I think SD should add is knives as a secondary; this would take the place of a pistol. I think it should be a one hit kill BUT it is limited to light body types and you have to be behind the guy, like an assassination. If you’re not behind the guy, it would be the regular knife attack. You could even make the player “spec” into it by putting it in the Operative tree. This makes the light body type a more of a get in get out type, which it was designed to be.
This is what the light should be
